Davit or hoisting and lowering apparatus for ships&#39; boats.



E. i.. M.' SIVAHD'.

DAVH 0R HOISTING AND LOWEBING APPARATUS FOR SHIPS BOATS. MPucmou min lum-:14.4915l 9mm/mfr E. L. M. SIVARD. DAVIT 0R HOISTING AND LOWERING APPARATUS FOR SHIPS BOATS.

APPLICATION LE JUNE I4. i915. 1,258,485. Patented Mar. o, 1918.

2 SHEETS-SHEET 2. {7l/#53 7 /A 8 ralf-.d

/N VEN TUI? EINAR L. M. SITTARD, OF NEW YORK, N. Y.

DAVIT OR HOISTING END LGV/ERING APPARATUS FR SHIPS BOATS.

ipeeeaien of Letters Patent.

Patented Mar. 5, 1918.

.Application filed .Tune 14, 1915. Se1a1No.33,915.

lle it liuou'n Eliot'. l. ETNM: li. M. Sonno, :i citizen ot3 the llniteil States. :nul :i resitientV ol' the l:oioufh oi Bronx. in the county ot Bronx :intl iltnte oll New vi'oi'li, have inwnteil eert'uin new :iuxl use'lul .linpifovenient#y in Du'vit'f: oi' lointiinp; :uul Lowering ."ipinu'uius Yl'or Ships Boutis. oi'.x which rthe followingis :i sini'ii'ie: tion.

'l`hi invention relates tio improvements in iluriis: oihoisting' :nul lo\.\'ii'ing' :unimi-:ilus ioi' shipsf bouts.

ll\v the uw of n\. in-,'eution l :uu enabled to iu'otliue :i :liniie ol the imei( extension tine. :loI iliotingniiolieil lioin the Yei'tiieel winning or pivot'zil types. u'hii-h will he gionilifel); sul" :mil oilei'uhle unilel' :ill eonlitionh` ot:x emploji'nunl no, loi' example, (luriing the rolling; ott' the ship :intl nuiji' he :ictuziteilV o :l1-iw :intl voi-ijf the Ii'l'ehout: with iiuliieient i-:ineil tluiinf :i severe li:-tt of the vowel: the hout-shiftinoy oil1o:ite:u'1 ving 1ue::u-` will olmos he noiin:1ll :intl posilivel).v loeleil :uninet: :u'i'iilenlnl movement in :any ilii'ietion :nul u'ill he (.cont'iollohle unil naomhli ymlely.' ln' :i positive iut'ufition ol" the ili'iiing menno. the noeiiiive :lei: of (iriviugf heingr :ulniteil :iutoinotitfully i'o unlock :nul piilnit nioa'inieiu ol the hont'-o:iii' \'in; uitbouw. :inl the it-lizisi h v the munitions V.:lutl otl :suoli positive iii-iuniiugj menno cuni# ingr tlu` uni-Vinile :Lenin heroine loeleil :lgriinat' iuowiuent ii eitlui tliiiition :nul eiuihlinil ilu hout io he lou'eieil oi' ifniseil i'ion: un); Huitolile position wiiliout :mjT ful*- tht-i Sop:ai:it'\ voeux-ino; oi loi-li'iug; oi" the mu'- Vinile.

lturthei'nioi'e my innnfovml appui-utils inovulen ineens nliei'ehjiY the hoitn'igi' :nul

:u'i'nng'einent of the hoisting :unl lowering lfollo oi' other bont suspending means in nut-l: ielntionsllil'i to the Inovuhle tineleextension. that such lnlls will during` the .swinging out of the truck-extension not ouhv prevent excessive sleek which would have .to he token up before the hoot; eoulil he lou'- eieil hut by suitohl :uljufstnient of the point ol,E :xitoelinleut o'li` the Stonfling' inuft oit suoli 'fullo4 will cause the hoot to he slightly elevated no :is to lilt the Hanne out; o't the ehoels lm-'lng' :i (lou'i'in'uiil movement ol auch et@ lensiou :intl :ill the puits will, he `in position. to he operated the inoinint i'he extension Venelles tilu level oi' the uniin tinck Seeiion.

lluitgheinioi'e in nii' preferrinl errungeiuent ot' the l'iills, the nioveinent of the extension tiuel; lioin one position to :mother will bouse :in initial slncliening olE mieli folle :intl then :i tightening thereof it reaches its4 other (.Xtzienie position so lhut eXeeSoive Slut-linens oi the ropes muy he in'ei'enteil :1t- :ill tiineay ,vithtnu; iniii'lei'ing with (he free movement' oi" sziiil ii'uelc erct'ensicm :mil :i f-usliioning eil'ei-,t o' the movement ol the eit'ennion ti'zul will he pioiluced together `vfi'h :i luifeing oi elevating" of the boot, :as :ilioie ileiei'ilieil.

ln the :uwolnimoving' ili'unings in which. siinilzuf i'elei'enife elnuueteirs (leb'g'nzit'e co1'- i'esi'uinuling' pru'ts t'hi'oughoui` the Several Views.

Figure l is iin encl elevation of :i lifeboat :intl hoistingf :mil lowering apparatus there foi' einhottving` my invention;

Fig. 1^ if; :in end View. looking iohooi-d, of :i Single tinck illustrating the :wrongeiuent oli' pulleys :it the outer end thereof;

ltig. 2 ii Section on the line .ll- A of ing-fi.-

lie. 3 i.-; :i Section on the line B-B of looking in the direction of the arrow:

l if; :i Section on the line C-C of 3 if: :i longitudinal Seetion on the line ol" Fig. 3 pin-ily in elevation of :i fly inoilifiefl :'ui'z'ing'ementi of the (lriv- :nfl lowering; means;

o tl is :mend elevation of another Shall inodilied torni of hoisting? lowering and traversing devices einbodyingl iny intention; Fig.. l is :i section on the line l-l ot rig. c;

Fili'. S ie an enlarged detail 'vieu' et the carriage and continuoue` parte Shown 1u lfo. G;

lf'ig. 9 ie a :itill further ei'ilargenient oit a loose tooth construction illustrated in liig.

llciierring noir to theee drawings 1 indicateg the boat deelt olf a etcanier 2.

ln tl e enibodinient ot iny invention ehoi'rn in lligs. l to inclusive hare illnetrated niy invention ae applied to what l terni an upper-deelt ilarit, though it will be obrioua that my nirention ie equally applicable to an int trdeclr dai'it.

ln iny Said preferred conetruction, two tiei'iiirl eac i ciiniprieing; upright bare or colunine7 three ol" which are indicated by the numerals Il, and resniectiyely, re suit ably secured to the deelt and braced in any Suitable well known manner. .lheee uprighte or coiuiune oil cach traino are counected together by yoltee (i and 7 rcepeetively troni uliich yoltofi are euapeuded a etatioiniry track S in :i horizontal position above cach end oil a lifeboat 9,4 each tract: extending' transversely to the arie oli the lifeboat and olf the Ship and the tracks ot the two trainee beingl parallel and eXtending.' inboard any Suitable distance so ae to enable the increment or traversing thereon ot one or a pli'lrality oil boats.

llach ot euch trat-lie S has :i hiifigod e teit. n tlf" piyoted at 1 to the Volte il and to the traer l so that it inay other register with and torni a continuation ot the trache 8 ae illustrated in Yfull lines; in Fig. 1j or may be swung upwardly eubetantially parallel to the ehipe :side as indicated in dotted lince in Said ligure.

ln the prt-lerrcd construction illustrated in Fig'. 1, the said extension ie ar "tinged to swing mrtically, though euch extension niay be arranged to swing horimntally il eo desired. rille eliteneion traclr 8 in prercrably :Supported by a toggle brace 12, which ie pivoted at one end to Said extension track at lf3, and having its other end piyoted at 1l: to an extension 15 olf the eupporting` traine. 'l'he tvo parte et eaid toggle brace are, as shown, piyoted together at 1G, and l pretcrably provide ineens Secured to the piyotal point 'lo tor raising and lowering the er'- t-eneion E in elation to the stationary track. t3. ne shown, l attach to the pivot 16 an ordinary blocl; 1T and at a euitalile point on the traine fasten a similar block 18. il rope 19 which is connected to the bloclf; 16 and passes over the block 17 and thence baci;q wai-diy over the block 18 to a suitable belaying cleat 20 provides; ineens tor hoisting the extension track Sa to the position indicated acadien in dotted linee in Fio'. 1 and said extension track niay ot course be held in such elevated position by securing the rope 19 to the cleat :20. lllhen the said tracl; is lowered the toggle brace 12 will brace and retain said extension track in its extended poeition.

llflountcd on the tracl; S and movable along :said track and also along the exteneion El when the latter is in its horizontal or regietering position ie a carriage or trolley 21 rolling on Wheels 22.

@The carriages: 21 oni opposite tracks; will oiE course be moved along the same for the purgoee otf traversing the boat troni its inboard to ite outboard positioue` and rice versta and for this purpoee l preferably pr fide a tlexible connection with said trol-- ley which inay comprise a chain extending 'troni one end ol Said trolley 23 outwardly ore' a suitable rope-leading device preferably ot the rotating or oscillating` type, euch ai" a pulley piyoted at the outboard end ol the extension t'ach S, thence inwardly through a tairlead or :merture 2G in the yoke (3 and over a pulley 2T nioun ted contiguoueI to said tairlead, and thence tarther in a rearwardly direction around a chain wheel 28 at the inboard end ot' the track 8, which with ite` associated elemente normally locke` said chain againet nieveinent in opposite directions as hereinafter described and said chain is thence led l'or- Wardly and secured to the opposite end ci the trolley 21, or the said chain may, as

preferred by nie, be a continuous or endless chain, ae illustrated in Fig. 5, which ei:- tendfsthrough an opening in thc carriage and ie rcleaeably connected thereto so ae to permit a relatire inoyeinent between the cui riage and the trayereing incane when it ie deeired to more the carriage more quickly than it ie poeeible to nieve the traversing connection. flach a releasable connection is illustrated in said Fie. 5 in which a chain El@ extends across;V and through the trolley and 'is normally connected thereto by means ot two oppoeitely disposed partie -l-S and respectively, which pairls are integral `with levers 4:9 49 respectively and are piyoted on shafts. 'oO-50:l :fixed in the trolley. These partis are normally retained in contact with the chain by helical springe I5ft-51a and the action ot' each ot euch Springsy is to 'torre the paul upwardly so as to jana the chain against pointed projecting ridges 5lon @rose pieces i3 ot the. trolley so that the car :age 'will at all tiniee be locked against inereinent relative to eiid chain in opposite directions, and the inclination ol the pau'le is euch that a pull on the chain in one direction will cause ay tightening or further janan ming of the chain between one oit the pa rle and its coperating ridge and a pull in the opposite direction on the chain will 1vauee Cir :1 11111111111' tightoniug of tho connection or 111111111111131' o3?f 1h11 01111111 1111111101111. 1111.1 1111111115110 1111111 111111 111:5 0111311011111@ 11111;'11.

111 111'11111' to 10111115111, tho 111111111 1111111 11111111 1110 01111111115'0 1111 111'11ll11l1' 111111111111111Y 11 511111 11111- 1111111110 .111111- 1-111-11 T1 1.111111100111011 or 01111111 i 11111.11` 1; 5, 0131111111511' 11 111111. 1111. 11h11, .111111- l 111111011 111111. 1111111 1111 to 111101100 the 1111.1. T111 wi 11111111 1h11 11111111. is 11 1111111151111 11111)' l 01111111 111111 1111 1111111111 11).' $11111 111.1111110 111 111111 1l11'1111111:111 111111 11h11 111111os1111 1111111 '111111. 151.1111111 S1111 111111.' 11h11. 1111115l o" 1111111, 111111111. 5111111111111' 11 111111 1111 11111 11111111111 1i' 111111. 111111,-'111 1111-1 111111111011111 111." 1il111 1111111 11:1 111101111111011 'tho 1'11ll01' 1111.111n be, 11111151111 111 1311111111111 11.1 1h11 0l111`111 .111 the 131111.111- 111111 111111111111111. .111 111115111111111111- '1t 11.: 171111111111111. 111 11111111 11111 111111.11111 '111l1o1111l vor); 1111101111' 1111' 1h11 1111111111111. 11111 111011.11111' 1111 11111111101' 11111111 1111111' 111111111111111' 111111 1.11.1111` :11111 111111111' 11111111111 01.1111111110 11S .1'111' 11111110 111111,11 11111 :111111 1S 1111 1111. 1111111 1111.111. this 111111011, 1111111' '1111 0111111111011 111 1111111111 11111 111111111110111'.y 111.E 11 .1111111111111 1'11111'1 111.1.' 111111511111111,1111111111; 11111' 11111111111111 lorli- 1h11 11-,1.'1'1\.1'.-111111' 01111111 1111111181; .111111.'111111111t 111 111111111111111 (111011111111111 111111111115110N 115#y shown :k3-5121"' .111 111111001210118 of 1h11, 11111101.1111' 33. 11111111'51 --l--I'flfn 111111 11 11:1111l-11'l11111l 35 :1re

11.1111111111 111.' .lio/ 1111.1 'to the Shaft "29 11111011. 11S 11111111011111. '1S 111111111111111 111111 P11111 1o 'rotate 111 :411111 1111111111115; P11. T1111 11111111-11'11001 11: 1111111111011 h1' 11 11111111-1111111, 37.

11 111111. 1111 tl111 111111111 '211 .111 01111 direction 1111111111 1h11 1:1111111-1'1'111111l 2S l'o 111.1` 510111111111 111 1111 1o 1111111111 1.1111 1111111111110' o14l 11h11 01111111- wltocl 111111, .1 -111011111' 11111111 111111. :1 C011- 111111111111; :511.1111111y l1111l1'11'111; 11111111.1111 11h11. 11111111111111111111 01"? 151111 11:11.11. 11111111111 11.111111111111111' 111 that 11.111110- 11'1111'1. 1111 1:1'1111'11111 111 1111ll 1h11 111111111 Q11 111 11111 111111118111' 111111111111111 will 111111011 :1 5.4111111111' 111111111111111 11g-111111111 131111 111111111011111 1'111'1'11111: Wheel :1,1111 11 111111,@11111111111' 111111111111' :11111111511 111111'111111111t 111.tl111t1l11011111111. 131.11 1111111 1 11111111111111111111, 111 1'11111111 11h11 11111111-11'111'11 11111101111'. tho 011:1111111'111111 51 111:1 11v 111' 11111111111 111111 15.1111 01111111 1111111111 111 111111111' 111111111111111 111111111` with or :1111111151A 11111' 111111 1111 11111 111111111 "117111111, 1h11 01111111 "1.11 1111111 111111'1111 1h11 11111111.11v Q1 with 1171111111 i1 1&1 111111110011111 will. o1E 11111111411 111- 11111111111 :11111111111111- 1" 11101; S 111111 F1 111111 1111111111 :11011515 111111111' posiitivo control 111111 will 1111. 111111111101'.-

1111 1.1 1 the movements of the ship, 111101 muy 1111 f-toppocl with perfect Security :1t any 111 11t 111111111 the truck for the purpose of low- 111'11111' 11. l1f0bo11t therefrom Without further :111151111110v 1110 111111111011. or trolley in :my 1111111- 11er.

5511111111111 11111111111 is provided for Suspendng 11 life-hoot 11'11111 s11i1l carriage 111111. 'for lowering 11111l 51111111 111111111111111, 11nd for this 11111-110011 1.111111111111111 11150111110 11 flexible 01111- 1100111111 111111111 will 1111111 1:11111'110t points :1t 1111111131111 .0111011 of the 1111'011 l1 of the exten- 1111'111 t1'1111l1'v S so tl111t all excessive Slack 111 11111y 111111111111 connection will be tal-:11,11 111) (lur- 11111' 11110 1111 \'111110111' 111" the extension track 1o '11s extromo positions 11111l furthermore, by 1110h :111 :11'1'1111g11111011t l 11111 01111111011 by 11 suit- :111111 111lj11 1t1111111t o1',l the rope 111111 the retaining' 1:1.'111t110t 11111110 the pivot 11o 01111.00 11 lift- 1110' or 0111111111111' of the boat from 11's ohooks 11111111 11111 111111111110111 of' tho extension track to 11s4 112111111111111 111' registering position.

)is 1111111111 I 111111111111, 'for tho purpose 11110111, 5111' 'liortlh 11 1:11110 o1' fall 3S which 11111)' l10 111111111101| V111 11.111' s11it11l1l11. 111111111111' :1t tho 111- l1o111'1l 111111 or. 11111 ill11111r1111111 111 Fig. 1, 1111151 l11=y m1111111 1111 111111 held 1111 11 10111111111' 11111111. S151. The 'F1111 18 1111051113 from the, drum 30 1111111111111' 111'1'11.' 11. 111111111' 110 o11 1111.1, 1l11\'1t 11.111110 to 11 111111017 411 :1t the 11111011111 131111 of truck 8 11111l J1111.111011 mitwzuclly l111111111tl1 111e pivot ll o1t the extonsion 1111011 at which 1111111t '11115l 11111111t111l to contnci' 111th tho track 111111.11 1h11y 511111 111.1111111311111 1S moved to its -1f11l1l111l 1111S1tio11, th11110e 111101' pulley 412 which is' loom 1111 Shnlt flB 1111 1.1111 trolloy 2K1`r 1111111100 11111111 11111111111 :1 1 11ll11, 411 111 hlook 44 which is :11001111111 to 11110 111111 of the li'l'e-lJoat 111111 is 1111111 11111 1111 111111' 111111111' 115 which 111111, pulley -1-9 is 101.15111. 1111 the Shaft 13 1111 tl111 1110111151 Q1. From this point 5111111 1'0110 pas-.'11s outwardly 111'11111111 pulley -1-11 1113 the outboard 11,1111. o1C tho 1'1xt1111sio11 truck 8 Wh1`0h is 1111'011111 on the s111110 s111111 11s the 01111111 pulley 25 but is 11o- 1'111011 1111111111111110111113T thereof, 1111.11 thence 1.111011'. 11.111.110 111111 contiguous to the pivot 11, to 1111 111.10 117 111 tho 1101111 G, to which the enel 011' tho 111ll 38 'is 11011111111011111' s11011r111l. The Said 1.101111 11111?, instead of 110111,01 So 1301.11111- 111111.11131v 511.0111011, Simply have, 11 retaining 111111- t110t at or nhout 1h13 position of s111111 115111.

1171111.11 tho trolley Q'l. is 1111111111 along' truck --Sa 11111 111111 51S 1'111111115 over these 11111111515 112N 111.1 111111 i117 111111 tl111 11i-111101111 is thug 0111'- 1'11111 0111' or 111. 1111 11 111111 absolutely 11111111191 to 1111101; Q -S,

1171111.11 1h11 1111111Y 1S 11.1 1h11 11e-1111111 110011311111 'For loworng', th11 A111111111111 ond of l'nll 3S is 1111111 out. 110111111111111 over 11111111510 40. Lill, 119 :11111 '-1-1 111111 thel hout is lowered.

13)' lo011ti1'1f the 11,3111, 17 111'y a proper 11111111113 111.11110 the 1111111 l1, approxhnntelv :1t 'the s111110 1115111111311 1111.111111 11S the 1'01111 38 is b11- low, it is possilolo lio move extension track 8 to registry with the stationary track 8 or vice versa without appreciably changing the tension in rope 38, which during this operation renders around pulley For 'the saine reason chain 2st passes through fairlead 26.

By this arrangement the track extension 6 can be lowered from its upright position to horizontal position without causing excessive slack in the boat-fall 36 or driving chain 2a which would have to be taken up before the davit could be used and every thing is ready for launching the boat the moment the extension 6a is in place- Furthermore by simply screwing the eye bolt el? in or out or moving the same vertically in a slot a couple of inches, the flexr ble connection can be adjusted to be either under the same tension when the extension is in extreme positions or tighter when the arm is down than when up. ln either case the flexible connections will be slack during most of the movement. The boat may, therefore, be lifted an inch or so out of the chocks in dropping the arm, and the weight of the track will be sullicient to lift even a loaded boat on account of the enormous leverage.

The operation of the apparatus in launching the boat is as follows:

The rope 19 is cast olf cleat 2O and the track extension by its own weight let down from position until it forms a straight continuation of the track as 8a'. The weight thereof is then supported by brace 12.

After clearing away boat gripes and chocks in the usual manner and elevating the boat from the keel-rcst by the movement aforesaid, the carriages or trolleys 21 on each of the two davits are moved out on their respective tracks 6---8d by two nien each pulling the hand-ropes 37 of their respective davits and the boat suspended from the trolleys is brought out clear of the ships side to the desired position for lowering which is effected by the paying out of the inboard part of boat falls 38.

lt is not necessary that both ends of the lifeboat are brought out simultaneously be cause the flexibility of the ar "angement is such as to allow considerable variations in this respect.

lt will be seen that the boat is always un der absolute control as the arrangement for moving the same is self-locking and if it is not desirable to bring the boat all the way out before lowering, it may be stopped at any suitable point on. the way and lowered from there just as readily and safely.

The boat moves out or inboard on a course parallel with the track, so that normally, when the ship is on an even keel, there is only the friction of the moving parts to overcome and as there are no eccentric intensa wrenching or twisting stresses on the moving parts common to most other types of davits this friction is reduced to a minimum.

The operating` mechanism can, therefore, without undue sacrifice of handling speed, more easily than in at present existing' types of davits, be made powerful enough to handle the boat under adverse conditions, such as against a considerable list of the ship or when the ship is rolling heavily.

An additional advantage when the ship rolling is that the boat is suspended very close under the davit, as any desired outreach can be obtained without increasing the distance between upper and lower blocks of the supporting tackle, as in other davit-s. ln this way the boat is under better control while being brought out.

Under certain circumstances, especially in handling smaller lifeboats, it may be ad vantageous to use the driving mechanism also as hoisting gear. Fig. 6 illustrates one such arrangement.

ln this construction the. track may be any suitable section, Lbeam, as here shown, preferred. On the trolley 61 the driving mechanism is located; the hand-wheel 62 is actuated by hand-rope 63 which goes around the hand-wheel 62, over pulley 64 at outboard end of the track, from there over pulley 65 at inboard end of same, down in a bight so that it may be operated from the deck and up over pulley 66 at inboard end of the track back to hand-wheel 62. The hand-wheel 62 is keyed to a shaft 67, 'which is free to rotate in bearings in trolley 61. 0n shaft 67 is a spur-pinion 68 mounted precisely similar to chain-wheel 28 above described, so that itis self-locking when directly actuated upon by any force at its circiunference, striving to turn it, but may be turned in either direction by actuating the hand-wheel 62.

Pinion 68 meshes with spur-gear 69, loose on shaft 70 which is mounted in the trolley 61. On the same shaft is a small rope-drum 71 fixed to or cast integral with gear 69, and also rope pulley 72, both loose on the shaft. What corresponds to the inboard part of the hoisting rope or boat fall 7 3 is belayed on cleat 7e on the framework, passes over pulley 7 5 and around pulley 76 at inboard end of track to trolley 61, where it is wound several turns around drum 71, and from there down around pulley 77 in lower block up over pulley 72 in the trolley again. From the trolley it passes around pulley 78 at outboard end of the track back over pulley 79 down to cleat S0 on the framework.

This part of the rope is joined to the part belayed on cleat 7 d forming an endless rope of suliiciont length to lower the boat into the water..

On the trolley 61 is pin S1. 7When the trolley in its inboard position against the stop the pin ill is engaged by the hook 83 on .lever Sl pivoted to track (50 at 85. ily pulling down the handle 8G the hook l B is lifted to release pin 81.

rl`he operation is as follows:

llllhen trolley 6l is at the inboard position. held by hook 83, the lifeboat may be hoisted to desired height by pulling hand-rope C3 in the proper direction, the .slack in the inboard part of the boat-fall 73 meanwhile being taken up as it comes off drum Tl and belayed on cleat 7st. The trolley is then released by pulling' handle 86 and a continued pull on i hand-rope 63 in the same direction as before will then cause trolley (il to move outboard on track carrying the lifeboat along on a course parallel to the track as above described. When in desired position, the boatlowered by paying out the boat-fall from cleat 80.

When the trolley 61 is at the outboard end of track 60, the boat may be hoisted in the same manner as above described when at the inboard position. No hook to hold the trolley is needed at the outboard end while hoisting as the pull in the hoisting rope tends to hold the trolley against the outboard end of the track.

lllhen the boat is hoisted high enough, the :lall 73 is again belayed on cleat ift and the trolley is moved inboard by reversing the pull in hand-rope G3.

One advantage of using an endless boatilall, reve in the manner here described, is that the rope is worn evenly for its whole length and not for only a small part thereof, as usually is the case.

lf the beat, while being brought in or out, could always be hoisted close up under the trolley 6l so that the upper and lower blocks of the tackle are close together, this arrangement would give as positive a control during the operation as the :nfrangemeut illustrated in Fig. 1.

lt may not always be possible to do so, and in that case this arrangement will under all circumstances j :nevent the trolley from moving outboard except under full control in that direction, but will not prevent the trolley from coming back inboard when the ship is rolling, and therefore, a device must be added to overcome this defect, and 'insure complete and self-acting control under all circumstances.

A rack S7 is lined along the track d() and its outboard extension, so as to mesh with gear G9. Rack 87 does not, however, extend all the way to the ends of track 60. lllhen the trolley 61 is at the eXtreme inboard or outboard position, gear G9 is out of mesh with rack S7, and the boat may be hoisted, but as soon as the trolley is moved away from either end, gear 69 engages the rack.

As gear 69 also engages the self-locking driving mechanism :it is evident that trolley ill can not move on taek (SO except as impolled by the pull in the handaope 63.

In order that gear 69 may always mesh properly with rack S7 when engaging same from either end, the first tooth 88 at either end of rack 87 is not fixed, but pivoted on pin 89 in slot 90 in the rack so as to allow a slight movement to either side from its normal position, which it retains by its own gravity.

A toot-h of gear 69, striking the tooth 88, will detlect the same to one side or the other sulliciently to slide into its proper space in 'the rack or nearly so, so that if the second tooth 91 of the rack is slightly rounded, gear and rack will be brought into proper mesh.

As the pitch diameter of gear 60 is equal 1.o the diameter of rope drum 7l., gear G9 will move along rack 87 at a speed equal to the speed with which the trolley moves along the track 60 under the pull on rope 73.

lilaving described my invention, l claim:

l. Hoisting and lowering apparatus for ships boats embodying therein a pair of parallel tracks suitably secured on the ship and arranged to project beyond the ships side, a carriage mounted on each of said tracks, means for suspending a lifeboat from said carriages and for hoisting and lowering the same, means for propelling said carriages along the tracks in opposite directions to traverse the lifeboat and means associated with such propelling means for preventing movement in either direction of the carriages except by positive actuation of the propelling means.

Q. l-loisting and lowering apparatus for ships boats embodying therein a pair of parallel tracks suitably secured on the ship and arranged to project beyond the 'ships side, a carriage mounted on each of said tracks, means for suspending a lifeboat from said carriages and for hoisting and lowering the saine, means, independent of the suspenl sion means, for propelling said carriages along the tracks in opposite directions to traverse the lifeboat and means associated with such propelling means for preventing movement in either direction of the carriages except by positive actuation of the propelling means.

3. Hoisting and lowering apparatus for ships boats embodying therein a pair of parallel tracks suitably secured on the ship and arranged to project beyond the ships side, a carriage mounted on each of said tracks, means for suspending a lifeboat from said carriages and for hoisting and lowering the same, means indepr-mdent of the suspen sion means for propelling said carriages along the tracks in opposite directions to traverse the lifeboat and means associated with and releasable solely by direct actuation et the propelling means for normally locking the carriage against movement along the track in either direction.

i. Hoisting and lowering apparatus for ships boats embodying therein a pair of parallel stationary t "Licks, a pair ot extension tracks normally retained in a position substantially parallel with the side of the ship and pivoted to swing into registry with the said stationary tracks, carriages movable along said stationary and extension tracks; liexible connections associated with said carriages and having a boat suspended in termediate the ends thereof, guiding' devices lor saiifl flexible connections at the outer ends ot' 'said extension tracks and means stationary in relation to said stationary tracks tor supporting and controlling portions oli said flexible connections on opposite sides ot 'said guiding device to cause the suspended boat to be lii'ted by the outward movement of saidextension track.

5. l-loisting and lowering apparatus tor ships boats embodying therein a stationary track, a movable extension track pivoted at one end to said stationary track to swing from a posit-ion parallel to the side of the ship into registry With said stationary track, a carriage movable along said track and means tor propelling the same, a flexible connection for manipulating the boat extending on opposite sides of the pivot ot' said extension track, a guiding device for said tlexible connection at the outer end ot said extension track, means stationary With relation to said stationary tracks for tastoning` one vend ot said flexible connection contiguous to the pivot of said track and means for guiding and supporting that portion of the lileziible connection on the oppo site side olf said guiding device to cause the 'same to be carried with said track extension when the same is moved. i

G. l'loisting and lowering apparatus for ships boats embodyingv therein a stationary track, a movable extension track pivoted at one end-to said stationary track to siving from a position pa yallel to the side oil the ship into registry with said stationary track, a carriage movable along said track and means tor propelling the same, a pulley at the outer end. et said extension track, a rope associated with said carriage and suitably fastened at one end at a point stationary with relation to said stationary trac rs and contiguous to the pivot thereof, passing` over said pulley and having the portion of said rope at the opposite side of said pulley guided and supported to be carried by and moved With said track extension, means also stationary With relation to said extension track i'or controlling said last mentioned portion of said rope and a intensa or said extension track, an adjustable fas- L tening device located at a point stationary with relation to said stationary tracks and continuous to the pivot thereof, a rope iastened to said fastening device, then passing over said pulley and having the portion ot o said rope at the opposite side ot said pulley guided and supported to be carried by and moved with said track extension, means also stationary ,in relation to said stationary tracks for controlling said last mentioned` portion ot' said rope, and a boat suitably suspended on said rope l'rom the said carriage.

lloisting and lowering apparatus ior sirius boats embodying therein a stationary track, a movable extension track pivoted at one end to said stationary track to swing troni a position parallel to the side ot the ship into registry with said stationary track, a pulley at the outer end of said extension track, a carriage mounted on said tracks, an endless traversing liexible connection exd' on opposite sides of the said tracks, passing around said pul ey, means tor causing the parts of said flexible connection to be carried by and moved in substantially parallel planes with said extension track, means tor releasably connecting the carriage with said traversing connection and means tor raising and loivering the boat from said carriage.

9. Hoisting and lowering apparatus for ships boats embodying,` therein a stationary track, a movable extension track pivoted at one end to said stationary track to swing M from a position parallel to the side of the ship ,into registry ivith said stationary track, a pulley at the outer end of said eX tension track, a carriage mounted on said tracks, an endless traversing flexible connection extending on opposite sides of the said tracks, passing around said pulley, means tor causing the parts or' said ilexible connection to be carried by and moved in substantially parallel planes with said extension track, automatically actuated oppositelydisposed pavvls ior connecting the carriage with said traifersing connection, said pawls being adapted to autoniiatically lock the car riage against movement relatively to said connection in opposite directions and means tor independently releasing one of said pavvls to permit relative movement of the lle carriage in one direction while maintaining lockingg` connection against movement in the opposite direction.

10. Hoistng and lowering` apparatus tor sllips` lloat's cnillodyinl;l therein a stationary track, a inofallle extension track pivoted at one end to said stationary track to swing .troni a position parallel to the side oli the ship into registry with said stationary track7 a pulley at the outer end of said extension track, a carriage mounted to nioi'e along said tracks, a traversing tlexible connection connected to said carriage extending on oppusite sides ot said racks7 passing around .said pulley, means iter causing the parts ot said flexible connection to l e carried by and moved in substantially parallel planes with said extension track, an independent flexible connection suitably connected at `the inlloard end ot the stationary track, led outwardly beneath said extension track and around said pulley, ineans tor causing the parts ot' said independent tlexillle connection to be carried ily aud moved in substantially par allel planes with said extension track, and a lloat suitably suspended :lronl said con- .nei-tion.

ll. llosting) and lowering` apparatus for ships lioats embodying therein a stationary track1 a inovalile extension track piroted at ene end to said, stationary track to swing lil-oni a position parallel to the side oli the ship into rrgistry with said stationary track, a pulley at the outer end et said extension trat-k7 a carriage mounted to .more along said tracks, a 'traversing tlexitlle connection connected to said carriage extending on opposite sides Uil" said tracks, passingI around said pulley, lneansI lor causing the. parts ot said l'lexlale connection to be carried by and moved in substantially parallel planes With Isaid ente sion track, nleans 'tor propelling` said ''lexlile connection, nieans releasable solely lly direct actuation of said propelling means tor normally locking said traversing connmclon against inoveinent in either din reetion and means ilor raising' and loweiinga lloat trein said carriage.

ll'osting and lowering apparatus for ships lioats eiuliodying` therein a stationary track7 a noYal'lle extension track pivoted at one. end to said stationary track to swing troia a position parallel to the side et the ship into regisl ry with said stationary track, a pulley at the outer end ot' said extension track, a carriage mounted to lnove along said tracks, a trave sing Vflexible connection connected to said carriage extending on opposite sides ot said tracks, passing' around said pulley7 ineans 'for causing the parts et said ilexilile connection to be :arrcd by and noved in substantially parallel planes with said extension track, ine-ans releasable solely by direct actuation l'or normally locking said traversing; connection against movement in either direction and an independent rope suitably connecte-(fl to the inlloard end of the stationary track io perinit a lengthening and sln'n'tening tliercojt to raise and lower the lloat7 said rope running over pulleys on said carriage, haring a boat suspended therefrom and heine' led outwardly beneath said extei'zsien track, around the pulley at the outer end ol` the extension arni, and lneans tor causino the parts oli' said indepenflent rope to rhe carried hy and nioi'cd in talllstautially parallel planes with said eX- tenson track.

In Witness whereof, I have signed my naine to the foregoing specification in the presence ol two subscribing1 witnesses.

ERL-llt L. M. SIVARD.

Wi tnesses:

l'lnilnn V. HOLMES, tiranno Vinton.

Copies of this patent may be obtained for ve cents each, by addressing the Uommissoner o1' Patents,

Washington, D. E. 

